Add a failing test case for reporting die() from within SIGDIE.

Grinnz provided this test case on Freenode #perl.  It shows that die()
within a SIGDIE handler is not reported.  Instead, the original error
is thrown without any indication why it wasn't handled as intended.
Expose exceptions thrown from SIGDIE handlers.

This change causes both the error that triggered a SIGDIE and the
error within the SIGDIE handler to be rethrown together.
Bump the version for release.